I've always felt that something is worth what someone is willing to pay for it!

With that said, there are some 'mega collectors' in Europe and the far East that are assembling massive collections of the original vehicles in our hobby/sport. Delta and Yokomo seem to be popular with collectors - probably due to their somewhat limited numbers and interesting evolution.

It's nice to see the pricing coming back around on some of this stuff; like pretty much everything else it has market swings.